Grinding-tool



H. McNICHOLAS.

GRINDING TOUL.

APPLICATION FILED JAN. 15.

u mam [c1 [Yamaha/a7 Patented Mar. 1, 1921.

Him/72 a citizen of the the county of Franklm andber of the tool head in the journa bearings 0 the bearing is then um'rso s'm'rss PATENT. omcs.

To all whom it may concem:

Be it known-that I, HIRAM M'cNIoHoLAs, United States, residing at Oonnell, in State of Washin new and useful Tools, of which tion.

Myv present invention relates to' an improved grinding tool for grinding curved surfaces, and involves a manually operated tool for this purpose especially adapted for grinding and trulng journal bearings of ton, have invented certain mprovements in Grindingthe following-is a specificashafts. The subject matter of the invention is es eciall useful in rindin and truing p f crank' shafts of internal combustion engines, wherein the shafts are difiicult of access for rinding and usually are removed entirely rom the engine for the purpose. By the utilization of my invention I am enabled to grind the journal bearin of the crank shaft without the necessity for removing the shaft from its engine, by first disconnecting the connecting-rod from the journal bearing, and then applying to the journal bearing the oscillatible-or rotary grinding tool, and ground and trued by manipulation of the tool while on the bear- 1n i o attain the above ends and achieve the required results I utilize a sectional tool head having a handle for manual operation with an oscillatible motion on thebearing, and the invention consists essentially in combining with the tool head in novel formation, grinding or abrasive members for frictional contact with the bearing, that invalve certain novel features and combinations and arrangements of parts as will be hereinafter more fully described and claim-ed.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention in which the parts are combined and arranged according to the best mode I have so far devised for the practical application of the principles ofmy invention;

Figure 1 is a side view of the tool, showing one section in vertically cut away position, and Fig. 2 is the other section or memfull side elevation.

For convenience of illustration and description I shall confine the invention herein described to use with a crank shaft 1 and Specification of Letters Patent. Application flied January 15,1920. Serial No.

' understoo of of the shaft 1 in internal combustion frequently are provided with butterfly Patented Mar. 1, 1921. 351,553.

its bearin or journals 2, but it will be course that the tool is adapted with equal facility for grinding and truing other cylindrical curved As is Well known in the art the journal bearin 2 engines become worn to an, elliptical form in cross section, and the tool is specially adapted for trulng and grinding these deformed bearings, being formed with a tool-head comprising the separable sections 3' and 4 that may be clamped around the arlng or journal to be trued while the shaft is in normal position, but afterthe cfinpecting rod has been detached 1 from the s a v The two tool sections are semicircular, and each fashioned with a pair of lateral mtegral lugs 5 and 6, the opposed lugs being arranged parallel and alined to receive the clamp bolts 7, and the lugs are spaced apart by the spacing bolt-nuts 8, 8, threaded 011 the bolts and jammed against the adjoining faces of the lugs as shown in Fig. 1, while the protruding threaded ends of the bolts nuts 9 for clamping and securely holding the bolts and In s in rigid relation.

n placing the tool head in position for grinding, it will readily be apparent that the separated sections are placed about the journal, having previously been adjusted as to the spacing nuts, and the butterfly nuts are turned home to clamp the tool sections in rigid relation in order that the head may be oscillated on the journal. For the required oscillatory movement of the head I utilize a selected one of the several bosses 10, a pair of which is provided on each section, and the bosses form integral sockets for the insertion of the threaded end of a handle bar or rod 11 of. usual shape and suitable length tobe grasped by the hand and threaded into the socket and form the handle for manipulating the tool head in oscillatory movement on the journal.

Each section of the tool head is fashioned with a dove-tail. socket 12 having a lateral opening as indicated atthe lower section in-Fig. l and having an inner opening likewise illustrated in Fig. 1, to accommodate the abrasive blocks 13 in their housings or casings 14. The blocks are of suitable abrasive material as emery or stone, and are formed as circular segments or portions of a ring to' be retained in the housings or casin 14 preferably of'metal and fashione with a curved base 14','end flanges "14, and a sideflange 14 thus permittmg At one of its ends each of the housings is fashioned with a transverse rib 15, in-

' centrally center lug as shown tegral with a flange 14", and the rib is seated in a complementary groove 16 in the lug 16' of the tool section withv a freedom of movement-to enable the housin to swingto a limited degree on the rib an roove as a hinge or ivot. The lug in eac section is the complementary sockets in the sections and the grooves periphery of the sections opposed relation at the o osite sides of the in 1g. 1. It will be noted that the housings for'the abrasive blocks are smaller than their sockets, to permit the interposition of cushion members '17, of rubber or other resilient material, between the walls of the sockets and the housing, these members or casings being shaped to engage between the free end of the housing and the end wall'of a socket and between the curved outer peripherj of the housing and complementary, wal of the socket.

B means of the complementary formation of the socket, metal casing, block, and resilient cushion, it will be apparent, the block is retained in its socket, but, as before stated the block is permitted to have a p1voted movement on the rib and groove 1n order that its opposite end may be forced inward toward the center of axis of the tool head. For this urpose a set screw 18 is provided for each block, threaded through a, socket or aperture 19 in the tool section, and bearon the metal casing of the block. When mg the adjusting screw 18 is turned in the and ts casing are forced inwardly as indicated in Fig. 1, in order that, in addition to the approxlmate adjustment provided for between the two tool-head sect1ons,'a closer adjustment may be had for frictional engagement with the journal hearing by the abrasive members. Y

The tool is oscillated by alternately pushing and pulling on the handle 11 and the head is oscillated transversely of the shaft and the housingcoated and forms the end wall of I are formed, near the inner and disposed. in

and its journal, and the successive grinding movements of the adjusted abrasive or grinding blocks in frictional engagement- 8 with the journal will grind down the peripheryof the journal and true its surface. At the start of the regular or protru bearing, as they, are encountered resiliently backed grinding members, will g portions of the 'ournal cause-these members, at their free ends, to

swing outwardly, slightly of course, on their pivots or hinges,' but the frictional contact 1s maintained in order that the protrusions may be rubbed down, and as they are rubbed down,-the set screws 18 may be turned to force in the grinding locks to grinding operation, the iry the radually compensate for wear, until the journal is.

trued. It is desirable that the head be ad- 'usted from time to time on the journal to ring different blocks in contact with other surfaces of the journal, and this may be done by shifting the lever handle from one to another of the selected sockets provided therefor, and the scillations of the head are continued until the desired result is attained. In this manner the tool may be applied successivel to the journals of the crank shaft, whi e the latter is still in situ and the grindin may be accomplished with facilit and espatch.

hat I claim is- 1. A separable, sectional tool head having a handle and means for securing the sections about a journal, each section formed with lateral dove-tail sockets having an end groove, a complementary casing in each, socket fashioned with an end rib in a groove to form a hinged joint, set screws for said casings, and abrasive members carried in said casings.

2. The combination with a tool head having a lateral dove-tail socket, of a metal'casing having a hinged connection with the wall of said socket, an abrasive member in the casing, and means for adjusting said casing on its hin ed connection.

3. T e combination with a'tool head having a lateral dovetail socket, of a metal casing having a pivotal rib seatedina grooveinone end wall of the socket, a resilient cushion 

